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6 papers · 2 filters
Device-Independent Randomness Generation in the Presence of Weak Cross-Talk
Jonathan Silman, Stefano Pironio, Serge Massar
Device-independent protocols use nonlocality to certify that they are performing properly. This is achieved via Bell experiments on entangled quantum systems, which are kept isolat…
Exploring pure quantum states with maximally mixed reductions
Ludovic Arnaud, Nicolas J. Cerf
We investigate multipartite entanglement for composite quantum systems in a pure state. Using the generalized Bloch representation for n-qubit states, we express the condition that…
Effects of preparation and measurement misalignments on the security of the BB84 quantum key distribution protocol
Erik Woodhead, Stefano Pironio
The ideal Bennett-Brassard 1984 (BB84) quantum key distribution protocol is based on the preparation and measurement of qubits in two alternative bases differing by an angle of pi/…
Security of continuous-variable quantum key distribution against general attacks
Anthony Leverrier, Raúl García-Patrón, Renato Renner +1
We prove the security of Gaussian continuous-variable quantum key distribution against arbitrary attacks in the finite-size regime. The novelty of our proof is to consider symmetri…
A probabilistic phase-insensitive optical squeezer in peaceful coexistence with causality
C. N. Gagatsos, E. Karpov, N. J. Cerf
A non trace-preserving map describing a probabilistic but heralded noiseless linear amplifier has recently been proposed and experimentally demonstrated. Here, we exhibit another r…
A paradox in bosonic energy computations via semidefinite programming relaxations
M. Navascues, A. Garcia-Saez, A. Acin +2
We show that the recent hierarchy of semidefinite programming relaxations based on non-commutative polynomial optimization and reduced density matrix variational methods exhibits a…